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The astronomers, physicists and mathematicians of ancient Greece were true innovators. But one thing it seems the ancient Greeks did not invent was the counting system on which many of their greatest thinkers based their pioneering calculations. New research suggests the Greeks borrowed their system known as alphabetic numerals from the Egyptians, and did not develop it themselves as was long believed.

Dunbar's number is a theoretical cognitive limit to the number of people with whom one can maintain stable social relationships. These are relationships in which an individual knows who each person is, and how each person relates to every other person. Proponents assert that numbers larger than this generally require more restrictive rules, laws, and enforced norms to maintain a stable, cohesive group. No precise value has been...

Path arrived at the idea of limiting users to a network of 50 people following research done by Oxford University Professor of Evolutionary Psychology Robin Dunbar. He espoused that 150 is the maximum number of social relationships that the human brain can sustain at a given time and that 50 is roughly the outer boundary of our personal networks. Facebook's approach and that of other social networks from Bebo to MySpace and Google...